android="
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android:
layout_width="fill_parent"
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android:
layout_height="fill_parent"
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android:
orientation="vertical">
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<.karl.list.MyListView
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android:
layout_width="fill_parent"
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android:
layout_height="fill_parent"
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android:
id="@+id/listView"
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/>
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这里的MyListView是我们自定义的ListView，因为顶部的下拉刷新系统的ListView不能够实现，所以我们需要自定义ListView。
布局文件搞定，下面看下自定义的MyListView：
查看源码
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.karl.list;
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importjava.text.SimpleDateFormat;
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importjava.util.Date;
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importandroid.content.Context;
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importandroid.util.AttributeSet;
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importandroid.util.Log;
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importandroid.view.LayoutInflater;
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importandroid.view.MotionEvent;
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importandroid.view.View;
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importandroid.view.ViewGroup;
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importandroid.view.animation.LinearInterpolator;
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importandroid.view.animation.RotateAnimation;
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importandroid.widget.AbsListView;
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importandroid.widget.BaseAdapter;
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importandroid.widget.ImageView;
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importandroid.widget.LinearLayout;
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importandroid.widget.ListView;
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importandroid.widget.AbsListView.OnScrollListener;
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importandroid.widget.ProgressBar;
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importandroid.widget.TextView;
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publicclassMyListViewextendsListViewimplementsOnScrollListener{
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privatestaticfinalStringTAG="listview";
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privatefinalstaticintRELEASE_To_REFRESH=0;
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privatefinalstaticintPULL_To_REFRESH=1;
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privatefinalstaticintREFRESHING=2;
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privatefinalstaticintDONE=3;
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privatefinalstaticintLOADING=4;
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//实际的padding的距离与界面上偏移距离的比例
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privatefinalstaticintRATIO=3;
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privateLayoutInflaterinflater;
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privateLinearLayoutheadView;
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privateTextViewtipsTextview;
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privateTextViewlastUpdatedTextView;
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privateImageViewarrowImageView;
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privateProgressBarprogressBar;
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privateRotateAnimationanimation;
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privateRotateAnimationreverseAnimation;
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//用于保证startY的值在一个完整的touch事件中只被记录一次
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privatebooleanisRecored;
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privateintheadContentWidth;
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privateintheadContentHeight;
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privateintstartY;
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privateintfirstItemIndex;
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privateintstate;
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privatebooleanisBack;
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privateOnRefreshListenerrefreshListener;
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privatebooleanisRefreshable;
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publicMyListView（Contextcontext）{
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super（context）;
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init（context）;
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}
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publicMyListView（Contextcontext,AttributeSetattrs）{
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super（context,attrs）;
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init（context）;
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}
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privatevoidinit（Contextcontext）{
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//setCacheColorHint（context.getResources（）.getColor（R.color.transparent））;
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inflater=LayoutInflater.from（context）;
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headView=（LinearLayout）inflater.inflate（R.layout.head,null）;
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arrowImageView=（ImageView）headView
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.findViewById（R.id.head_arrowImageView）;
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arrowImageView.setMinimumWidth（70）;
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arrowImageView.setMinimumHeight（50）;
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progressBar=（ProgressBar）headView
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.findViewById（R.id.head_progressBar）;
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tipsTextview=（TextView）headView.findViewById（R.id.head_tipsTextView）;
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lastUpdatedTextView=（TextView）headView
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.findViewById（R.id.head_lastUpdatedTextView）;
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measureView（headView）;
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headContentHeight=headView.getMeasuredHeight（）;
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headContentWidth=headView.getMeasuredWidth（）;
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headView.setPadding（0,-1*headContentHeight,0,0）;
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headView.invalidate（）;
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Log.v（"size","width:
"+headContentWidth+"height:
"
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+headContentHeight）;
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addHeaderView（headView,null,false）;
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setOnScrollListener（this）;
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animation=newRotateAnimation（0,-180,
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RotateAnimation.RELATIVE_TO_SELF,0.5f,
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RotateAnimation.RELATIVE_TO_SELF,0.5f）;
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animation.setInterpolator（newLinearInterpolator（））;
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animation.setDuration（250）;
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animation.setFillAfter（true）;
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reverseAnimation=newRotateAnimation（-180,0,
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RotateAnimation.RELATIVE_TO_SELF,0.5f,
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RotateAnimation.RELATIVE_TO_SELF,0.5f）;
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reverseAnimation.setInterpolator（newLinearInterpolator（））;
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reverseAnimation.setDuration（200）;
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reverseAnimation.setFillAfter（true）;
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state=DONE;
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isRefreshable=false;
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}
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publicvoidonScroll（AbsListViewarg0,intfirstVisiableItem,intarg2,
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intarg3）{
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firstItemIndex=firstVisiableItem;
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}
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publicvoidonScrollStateChanged（AbsListViewarg0,intarg1）{
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}
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publicbooleanonTouchEvent（MotionEventevent）{
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if（isRefreshable）{
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switch（event.getAction（））{
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caseMotionEvent.ACTION_DOWN:
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if（firstItemIndex==0&&!
isRecored）{
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isRecored=true;
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startY=（int）event.getY（）;
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Log.v（TAG,"在down时候记录当前位置‘"）;
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}
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break;
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caseMotionEvent.ACTION_UP:
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if（state!
=REFRESHING&&state!
=LOADING）{
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if（state==DONE）{
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//什么都不做
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}
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if（state==PULL_To_REFRESH）{
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state=DONE;
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changeHeaderViewByState（）;
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Log.v（TAG,"由下拉刷新状态，到done状态"）;
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}
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if（state==RELEASE_To_REFRESH）{
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state=REFRESHING;
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changeHeaderViewByState（）;
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onRefresh（）;
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